Characteristics of different connection methods of slurry pumps

The connection methods between the slurry pump and the motor are mainly divided into direct coupling drive and belt drive. The characteristics of different connection methods are as follows:

Direct connection drive

Connection method

Direct connection drive (DC drive) means that the slurry pump and the motor are connected and driven through a coupling. The shafts of the slurry pump and the motor are on the same central axis, and there are no other transmission links in between. Common couplings include jaw couplings, pin couplings, and diaphragm couplings. The specific type of coupling to be used should be determined according to the type of the slurry pump and the power of the motor.

Advantages

Reliable operation and low failure rate: Since it is a direct connection, intermediate links are reduced, the probability of failures is lowered, and the stable operation of the equipment is ensured.

No power loss, high efficiency: The direct - coupled drive directly powers the equipment, reducing the equipment accessories of the intermediate belt connection. It also lowers the energy loss in the intermediate transmission process. It can efficiently transfer the power of the motor to the slurry pump, enabling the pump to operate with high efficiency. Meanwhile, the operation is simple. By reducing the intermediate links of the equipment, it reduces the cost and saves resources.

Disadvantages

The rotation speed is fixed, so it is not suitable to work accurately at the required operating point. When the rotation speed of the pump is inconsistent with that of the motor, direct coupling transmission can hardly meet the requirements.

Belt drive

Connection method

Belt drive means that the slurry pump and the motor are connected and driven through pulleys and belts. The belt plays a role in power transmission, and there is a certain efficiency loss. According to the changes in the relative positions of the motor and the slurry pump, belt drive usually has the following arrangement methods:

CR/CRZ drive: The slurry pump and the motor are on the same horizontal plane. R refers to right. When viewed from the inlet direction of the pump, if the motor is on the right side of the pump, it is the CR drive. Usually, a common base is also provided for the pump and the motor to ensure stable and reliable installation. This kind of CR drive with a common base is also called the CRZ drive. For large slurry pumps, due to their large weight and volume, a common base may no longer be provided.

CL/CLZ Drive: Corresponding to the CR drive, "L" means "left". When viewed from the inlet direction of the pump, the arrangement where the motor is on the left side of the pump is called the CL drive. Usually, a common base is also provided for the pump and the motor to ensure stable and reliable installation. This kind of CL drive with a common base is also called the CLZ drive.

ZV drive: Also known as the tailstock belt drive. The motor is fixed on the frame at the tail of the slurry pump, that is, the motor and the slurry pump share a common base, and the belt is located between the pump and the motor. The belt transmission direction of the ZV drive is vertical. By raising the base of the motor, the position of the motor can be elevated, which is suitable for working conditions where there is water at the work site to prevent the motor from getting water.

CV drive: Also known as back-mounted drive, the belt drive direction is also vertical. The difference from the ZV drive is that the CV drive motor and the slurry pump have no base. The motor is installed above the pump's bearing assembly, and a small motor seat is supported by bolts to place the motor. The installation of the slurry pump and the motor in this drive mode is relatively compact, which effectively saves space. At the same time, it can also prevent the motor from getting water, and it is an economical installation method, suitable for motors with relatively low power.

Advantages

Easy to change the operating parameters of the pump: The rotational speed of the pump can be changed by adjusting the size of the pulley, so that the required operating condition parameters of the slurry pump can be easily achieved, and the pump selection range is wide.

Smooth transmission: The belt has a certain degree of elasticity, which can buffer and absorb vibrations, making the transmission process smoother.

Overload protection: When overloaded, the belt will slip on the pulley, which can prevent the damage of weak components and play a role in safety protection.

Disadvantages

Prone to slippage and low transmission efficiency: During the transmission process, the belt will have a certain degree of slippage, resulting in partial power loss. As a result, the transmission efficiency is not as high as that of direct - coupled transmission.

The belt is easily damaged and the operating cost is high: The belt is a consumable part and needs to be replaced regularly, which increases the operating cost and maintenance workload.

Poor reliability, not suitable for transmitting power greater than 220 kW: The reliability of belt drive is relatively low. When transmitting high-power, the belt is prone to failures such as breakage. Therefore, it is generally not suitable for transmitting power greater than 220 kW.

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